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This Calculator Will Help You Convert Your Apartment into a Ball Pit

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These days, it seems like everyone wants to get back a piece of their youth. Whether it's adult coloring books or wine in juice boxes, nostalgic products and events are everywhere. But alongside all the fun things that come with being a child, there are also restrictive rules and a strict bedtime. Being an adult is great because we can eat ice cream for dinner, watch R-rated movies, or fill our apartments with playpen balls if we want

The National Building Museum in Washington D.C. recently filled their 10,000-square-foot Great Hall with white playpen balls for guests of all ages to play in. The event looked like great fun, but if you missed it, please know you can recreate it in your own living space. 

It's safe to assume the only reason why you're not reading this from the bottom of a ball pit right now is because you don't know how many balls to buy. It's risky committing to purchasing a bulk order of playpen balls only to realize you can't actually afford to fill the whole room. Or what if you buy too many? This special calculator will make sure you know exactly what you're getting into. 

Inspired by this xkcd comic, the calculator takes a number of factors into consideration—such as apartment area, packing efficiency, and the radius and price of each ball—and then calculates how much money your personal ball pit will set you back. The website will either save you from a costly mistake or illuminate a very affordable way to double your property's worth. 

If you need the metric system, please see the Berge version. And if you're looking to actually put this calculator to use, these balls should do the trick

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National Geographic Ranks The 25 Happiest Cities in the Country
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Feeling unhappy? Maybe it's time to move. National Geographic recently released rankings of the 25 happiest cities in the U.S. The results: Eight of the 25 locations are in the Golden State, but the honor of No. 1 happiest city goes to Boulder, Colorado.

The rankings are based on 250,000 interviews conducted in 190 metropolitan areas between 2014 and 2015. The survey—developed by Dan Buettner, author of the new book The Blue Zones of Happiness, and Dan Witters, a senior scientist at Gallup—looked for data points that are correlated with life satisfaction and happiness, like whether or not you exercise, if you feel safe in your community, whether you feel like you live within your means, and whether you feel like you are reaching your goals.

A map of the U.S. showing which cities made the top 25 happiest cities index.
Courtesy National Geographic

Of course, all that isn’t necessarily the result of your geographical location. But you don’t see cities like Los Angeles or New York—where wealth is also clustered—on the list, so presumably San Franciscans are doing something a little differently.

Take a look for yourself. Here are the 25 happiest places in the U.S., according to the results.

1. Boulder, Colorado
2. Santa Cruz-Watsonville, California
3. Charlottesville, Virginia
4. Fort Collins, Colorado
5. San Luis Obispo-Paso Robles-Arroyo Grande, California
6. San Jose-Sunnyvale-Santa Clara, California
7. Provo-Orem, Utah
8. Bridgeport-Stamford, Connecticut
9. Barnstable Town, Massachusetts
10. Anchorage, Alaska
11. Naples-Immokalee-Marco Island, Florida
12. Santa Maria-Santa Barbara, California
13. Salinas, California
14. North Port-Sarasota-Bradenton, Florida
15. Urban Honolulu, Hawaii
16. Ann Arbor, Michigan
17. San Francisco-Oakland-Hayward, California
18. Colorado Springs, Colorado
19. Manchester-Nashua, New Hampshire
20. Oxnard-Thousand Oaks-Ventura, California
21. Washington, D.C.-Arlington-Alexandria, Virginia/Maryland/West Virginia
22. Minneapolis-St. Paul-Bloomington, Minnesota/Wisconsin
23. San Diego-Carlsbad, California
24. Portland-South Portland, Maine
25. Austin-Round Rock, Texas

You can grab a copy of November’s National Geographic to read more about the world’s happiest places.

The cover of Dan Buettner’s The Blue Zones of Happiness and the cover of November 2017’s National Geographic.
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Here's How to Turn an IKEA Box Into a Spaceship
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Since IKEA boxes are designed to contain entire furniture items, they could probably fit a small child once they’re emptied of any flat-packed component pieces. This means they have great potential as makeshift forts—or even as play spaceships, according to one of the Swedish furniture brand’s print ads, which was spotted by Design Taxi.

First highlighted by Ads of the World, the advertisement—which was created by Miami Ad School, New York—shows that IKEA is helping customers transform used boxes into build-it-yourself “SPÄCE SHIPS” for children. The company provides play kits, which come with both an instruction manual and cardboard "tools" for tiny builders to wield during the construction process.

As for the furniture boxes themselves, they're emblazoned with the words “You see a box, they see a spaceship." As if you won't be climbing into the completed product along with the kids …

Check out the ad below:

[h/t Design Taxi]

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